Zak-Kul, a renegade scientist of Kandor and double for Superman, enlarges himself while Superman and Lois are in the Fortress of Solitude and deceives Lois into using a shrinking ray on the real Superman. Taking Superman’s place in the outside world, Zak-Kul even woos Lois and marries her, but she soon learns her folly. Superman escapes from Kandor, enlarges himself again, and sends Zak-Kul back to the bottle city. Lois’s marriage to the false “Superman” is annulled.